551988 has 48 divisors (see below), whose sum is σ = 1512000. Its totient is φ = 173664.

The previous prime is 551981. The next prime is 552001. The reversal of 551988 is 889155.

It is a super-5 number, since 5×551988⁵ (a number of 30 digits) contains 55555 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 551988.

It is not an unprimeable number, because it can be changed into a prime (551981) by changing a digit.

551988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1918 + ... + 2186.

It is an arithmetic number, because the mean of its divisors is an integer number (31500).

2⁵⁵¹⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 551988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (756000).

551988 is an abundant number, since it is smaller than the sum of its proper divisors (960012).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

551988 is a wasteful number, since it uses less digits than its factorization.

551988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 301 (or 293 counting only the distinct ones).

The product of its digits is 14400, while the sum is 36.

The square root of 551988 is about 742.9589490678. The cubic root of 551988 is about 82.0307241599.

The spelling of 551988 in words is "five hundred fifty-one thousand, nine hundred eighty-eight".